完成绘制后清除CGPath路径 [英] Clearing CGPath path after drawing is done
本文介绍了完成绘制后清除CGPath路径的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我已经编写了一个用于在iOS中使用touchesMoved（）方法绘图的程序。
I've written a program for drawing in iOS in touchesMoved() method.
CGContextAddPath(UIGraphicsGetCurrentContext(), path);
CGPathMoveToPoint(path, NULL, lastPoint.x, lastPoint.y);
CGPathAddLineToPoint(path, NULL, lastPoint.x, lastPoint.y);
CGContextDrawPath(UIGraphicsGetCurrentContext(), kCGPathStroke);
我如何清除绘制的路径并恢复原始视图？
How can i clear the path drawn and restore the original view?
推荐答案
也许您可以在图形视图上方放置一个不可见的视图，并仅当您确定用户不会撤消时才添加用户跟踪的路径。如果用户想要撤消操作，请不要将路径添加到上下文中。那是我的逻辑。我不确定该如何加以限制。
希望这会有所帮助。
Perhaps you can put an invisible view above your view of drawing and add the path traced by the user only when u are sure that the user will not undo. If the user wants the undo action, don't add the path to the context. Thats my logic. I am not sure how it can be implemted. Hope this helps.
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